Abdominal exercise device



FIG. 1 is a perspective view of an abdominal exercise device showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the figures are for the purpose of illustration portions of the abdominal exercise device, which form no part of the claimed design. 

CLAIM The ornamental design for an abdominal exercise device, as shown and described. 